<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    p{
      font-size: 30px;
    }
  </style>
</head>
<body>
<!-- 默认字号16 -->
<p>段落文字</p>
</body>
</html>
